To me, Diving hasn't just been fun and games. My students are aware of my approach and come to me for this reason.
This may actually be the key to understanding the whole discussion.
Thal trains scientific divers -- divers who have to be able to perform certain duties to a high level of reproducibility. That's not me, drifting a Caribbean reef with a camera. DCBC was a commercial diver, where people have to be able to perform tasks under conditions where the rest of us would stay home. That has to color someone's attitude toward diving . . . and if somebody wants training from someone who approaches diving in those ways, they have the right instructors in those two.
Diving, for all of our students, for me, and for the vast majority of people with whom I dive, is done as a recreational activity. That means that enjoying it ("having fun") is a crucial part of the process . . . if we are not enjoying what we are doing, there is really no reason to do it. I have taken scuba training that wasn't fun -- luckily, I was far enough into the sport for my interest and enjoyment to survive that, but one of my classmates has done little or no diving since, and another took three months off after the bad class, because diving
wasn't fun any more.
I'm sure there are people who don't want "fun and games" in training. I'm not sure, honestly, that I can describe my GUE, UTD or cave training as "fun and games". But when I looked at the big grins on the GUE Fundamentals students who shared the restaurant with us last weekend, I knew that the instructor had walked the proper line between intensity of instruction, and maintaining inspiration for the students. Where that balance lies is different, though, with a Fundies student, than it is with the person who walks off the street to a dive shop, having never done this before.
There is very bad dive instruction out there. But there are some good instructors participating in this thread, who simply see their goal as producing a diver who is capable of doing BEGINNER dives in their (the instructor's) environment, and making sure people have fun getting there. It's a completely different motive, and perhaps a completely different end that they are trying to reach, which may be why we always feel as though we are talking past one another.